Operating the Meter From the Front Panel

3

Measuring Frequency

Frequency Measurement Rates

The rate at which frequency measurements are taken is a factor of the frequency being measured (see Table 3-6).

When the frequency function has been selected, pressing Rhas no effect on the frequency update rate.

Table 3-6. Frequency Measurement Rates

Frequency

@> 150 Hz

@100 Hz

@60 Hz

@15 Hz

@10Hz

@5Hz

Reading Rate

1.8/sec

1.6/sec

1.3/sec

1/1.2sec

1/1.7sec

1/3.2 sec

Measuring Frequency of Current (100 mA and 10A) Inputs

Frequency measurements are always taken using the ac input circuitry of the meter. Normally, measurements are taken on the Xinput terminal. However, frequency measurements can also be taken on current inputs. If frequency is to be measured using a current input, ac current must be selected in the primary display and frequency must be selected in the secondary display.

When the ac current function in a mA range is selected in the primary display and frequency is selected as the secondary display function, the frequency of the current at the 100 mA terminal will be measured. Similarly, when the ac current function in the 10 A range is selected for the primary display and frequency is selected in the secondary display, the frequency of the current at the 10 A input terminal is measured.

Frequency Sensitivity Selection

Before a frequency measurement is started, the amplitude of the input signal is sampled and the optimum ac range is selected automatically. For most applications, therefore, the user need not be concerned with setting the measurement sensitivity for stable frequency readings.

However, if necessary, measurement sensitivity can be selected manually. To do so, use the dual display as described in the following procedure:

1.Power-up the meter and press Zor Dto select an ac voltage or current function in the primary display.

2.Press E,U, or Tto manually select an ac measurement range.

3.Press Sthen press Fto select the frequency function in the secondary display.

All frequency measurements on the secondary display will be taken on the selected ac range.

The maximum input voltage that may be applied on any ac measurement range for reliable frequency measurements is listed in Table 3-7.

The minimum signal for a stable frequency measurement varies depending on the frequency and waveform being measured.

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Fluke 45 user manual Frequency Measurement Rates, Measuring Frequency of Current 100 mA and 10A Inputs, Reading Rate
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45 specifications

The Fluke 45 is a versatile and high-precision Digital Multimeter that is designed for a wide range of applications in electrical testing, troubleshooting, and maintenance. Known for its reliability and advanced features, the Fluke 45 is an essential tool for engineers, technicians, and professionals who require accurate measurement capabilities.

One of the standout features of the Fluke 45 is its ability to measure both AC and DC voltage and current. With a maximum input voltage of 1000 volts and current ranges up to 10 amps, users can conduct a variety of electrical tests with confidence. The device is equipped with an intuitive dual display, allowing for simultaneous viewing of multiple measurements. This feature enhances usability during complex diagnostics.

The Fluke 45 also boasts an impressive resolution of 0.1 mV and a basic accuracy of 0.25%, which translates to highly reliable readings. The auto-ranging capability simplifies the measurement process, automatically selecting the appropriate range based on the input signal, thus saving time and reducing user error.

In addition to voltage and current measurements, the Fluke 45 features resistance measurement capabilities, with a range of up to 40 MΩ. This makes it an effective tool for testing circuits, identifying faults, and ensuring the integrity of electrical systems. The continuity test function, complete with a built-in beeper, assists in quickly diagnosing wiring issues.

Another remarkable characteristic of the Fluke 45 is its frequency measurement capabilities, which can measure frequencies up to 1 MHz. This is particularly useful in applications involving signal analysis and troubleshooting oscillators.

Moreover, the Fluke 45 is designed with user convenience in mind. It is lightweight and portable, making it easy to carry around, whether on a job site or in a workshop. The rugged construction, reinforced with high-quality materials, ensures it can withstand harsh conditions often encountered in the field.

To enhance functionality, the Fluke 45 features a data hold function that freezes the displayed measurement for easier reporting. Additionally, it can store data for later retrieval, making it convenient for users who need to compile test results over time.

In summary, the Fluke 45 Digital Multimeter is an advanced instrument that combines precision, versatility, and user-friendly design. Its wide measurement capabilities, high accuracy, and durable build make it an invaluable tool for professionals in diverse electrical and electronic applications. Whether for routine maintenance or complex troubleshooting, the Fluke 45 stands out as a reliable partner in achieving accurate and efficient results.
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